Unity 物体围绕圆周运动

用Unity开发游戏中，经常会有搜寻的功能，这时候我们需要一个放大镜的图标在那圆周运动。写了相关脚本直接挂载在要圆周运动的物体上即可：

using UnityEngine;

using System.Collections;



public class RoundAction : MonoBehaviour

{

    public float _radius_length;

    public float _angle_speed;



    private float temp_angle;



    private Vector3 _pos_new;



    public Vector3 _center_pos;



    public bool _round_its_center;



    // Use this for initialization

    void Start()

    {

        if (_round_its_center)

        {

            _center_pos = transform.localPosition;

        }

    }



    // Update is called once per frame

    void Update()

    {

        temp_angle += _angle_speed * Time.deltaTime; // 



        _pos_new.x = _center_pos.x + Mathf.Cos(temp_angle) * _radius_length;

        _pos_new.y = _center_pos.y + Mathf.Sin(temp_angle) * _radius_length;

        _pos_new.z = transform.localPosition.z;



        transform.localPosition = _pos_new;

    }

}